A helmet that doesn't fit is just an expensive hat

The no-name Amazon helmets might be certified on paper, but if they don’t fit right they won’t protect when it counts — they’re just expensive hats. Bring your kid to try on helmets in person, or order two sizes and return the wrong one. A helmet that sits too high or pinches will end up in the bushes the second you look away, which means you’ll be reading about MIPS technology at 11pm while your kid dreams about mint green helmets she’ll never own. I’ve been there.